Method and apparatus for cutting sheets



Oct. 19 1926. j 1,603,265 o. s. BEYER v METHOD AND APPARATUS FOR CUTTINGSHEETS INVENTOR 0616 a.

By Attornys,

1,603,265 O-[Sw BEYER METHOD AND APPARATUS FOR CUTTING SHEETS Oct. 19,1926.

Filed Ma'rph 21, 1925 2 Sheets-Sheet 2 INVENTOR Patented Oct. 19, 1926.

orro s. Emma, or-nnooxmm, NEW YORK, ASSIGNOR,

BY MESNE ASSIGNMENTS, '10 E. W. BLISS COMPANY, OF BROOKLYN, YORK, AOCR]?ORATION OF DELAWARE.

METHOD AND APPARATUS non. CUTTING SHEJTSf Application filed March 21,1925. Serial No.,-17,'421.

This invention relates to zig-zag cutters and to a method of cuttingsheets, and aims 'to provide improvements therein.

The invention provides a'method of cutting scalloped strips from sheetsof metal in such manner to obtain from the sheet the maximum of usefulblanks, and the minimum of scrap. Theinvention t'u'rther provides amethod which is rapid and which may be carried out by machines ofrelative line III-III, Fig. 2.

ly simple construction, and ble and reliable in action.

The invention further provides an apparatus having the above indicatedcharacterwhich are duraistics and advantages.

An embodiment of the apparatus is illustrated in the accompanyingdrawings in which Figure 1 is a side elevation of a machine in the formof a reciprocating press for cutting. j I

Fig. 2 is an enlarged vertical sectional view, on the line 11-11,

. Fig. 3 is a horizontal sectionalview on the Fig. 4 is avertical"sectional view on the line TV-IV, Fig. 3. Fig. 5 is a view of a sheetcut into strips such as is done by the present mcthodand apparatus. I

Referring, to said drawings, the cutter comprises a pair of coactingcutting dies 12, 13, and preferablya plurality of such cutting diescomprising a pluralityof cutting edges. 152i, (Fig. 4) and constitutinga socalled gang cutter.

The dies 12, 13 are mounted on stamping means whereby theyarereciprocatcd toward and from one-another for cutting. and'for thispurpose the one may be mounted on the bed .30 and the other on thereciprocating plunger 31 of a cran' l': prcss (Fig. 1).' The press has/ausual feed: ing means for intermittently feeding the blank endwise. the"feeding movements altcrnating with the cuttingstrokes.

The cutting edges of'the dies 12, 13, etc. are longer than the feedmovement, so that 50, the successive cutsoverlapand form.a-conciprocation. and to cut less than the full tinuous cut. Thedies,are-preferably ar ranged to makea progressive cut at each re length ofthe cutting edges 15, 16-, etc; there- "of and thereby'in a simplemanner-to avoid indentation by the corners of the dies of the,

(or eccentric) power vis', where the. wider cutters, will therefore beprogressive along the edges 15.16, etc. of the dies, so that there willbe simultaneous progressive, cutting of an interposed sheet.) The strokeof the plunger 31 and consequently the approach of the dies 12, 13 is,preferably so limited that the edges'15, 16, etc. do not cross at thelimit of the dies, and cut less than throughout their entire length theapproaching movement of consequently the sheet will be the full lengthof the edges-15, 16, etc. of

the dies. QonsequentIy' the sheet will not be dented by the corners 37of the dies. (Fig. 3). The inclination of the face 35 is pref- ,erablyslight, as thereby-the cut strip is not pressed downward by the movabledie to any considerable extent outof the plane of the sheet or to'suchan extent as'to receive a the limit of approach of the dies 12, 13reached. The cutting of a sheet of metal or other material) interposedbetween the permanent bend or set. Also, by such slight inclination,less movement of the diesapart is required the edgesido not cross and.thereby a less stroke of the plunger 31 is required. The plunger 31 maythereby be given a very short stroke, and hence may bereciprocated athigh sp'eedand the machine thereby enable'd to work rapidly.

The present apparatus and method have been particularly devised forthecrting of sheets into strips with scalloped of zigzag edges, whichstrips are in turn cut into round blanks or'into blanks of a similarnature where theblanks may be nested"on the sheet from'which they are tobe cut, that portions of one strip in-' cluding two or more blanks maycoincide with the narrower portions of the other strip. Such a cuttingof a sheet and therelative position of the blanks is illustrated in'Fig. 5.

For-cutting such strips, the cutters or cut- I to bring them to aposition where g I led ioe

ting dies 12, 13,are provided with zig-zag {edges as shownrmostclearlyin Fig. 3. ,The

cutting edges 15- 24 are of less length than the sheet, and the sheet iscut from end to. end by a succession of cuts by 'thecutter's, and asheretofore explained the edges 15,16,

etc: are preferably somewhat longer thantl1eout to be made, and-theupper and lowercoactingbuttingfedges do not cross at one endm thereofand thereby do not cut entirely the length thereof. 7 n The cuttingedges l5-24 have each the lengthyof a symmetrical part of the,zigzagline, and. hence make symmetrical "cuts at each successive cut. Thecontours of the successive cutters are similar but opposite,

each as compared with the next, as will be seen from looking at theedges 15 and 17 17 and I9, etc.,,Fig. 3. I q a After each cut the sheetis fed forward the necessary distance to enable the cutters to repeatthe previouscut, and suitable means {10 for this purpose are preferablyprovided. For example, the sheet may be fed between "a pair of rollers42, '43, WlfiCl'lland one-half blank is lost at theend of each alternaterow, as will be seen in Fig. 5, and

consequentlyt egreaterthe number ofrows the'greater th number ofhalf-blanks.

. Stripperplates 60, 61 maybe provided for pressing the stripsoutfrombetween the dies as th dies move apart. 2

The method and the mode of procedure in carrying'out said method will beapparent fromthe foregoing description.

The apparatus may receive other embodi-' ments t an that hereinspecifically illustrated nd-des ribed.

.WhatIclaimis: k v 1s The method of cutting a metal sheet .lntoscallopedstrips extending longitudinallyof the sheet, which comprises feeding thesheet lengthwise iiltermittently, and by tervenmg simultaneous shearing,cuts forming the opposite sides of'the reversedscallops ofpne laterralseries, the successivecuts COIIICidIHg to cut the continuous strips.

2. The method of cutting metalsheets in'to scalloped, strips, comprisingdividing by in; termittently and progressively shearing said 'sheet fora part of its length along a zigzag line, and feeding said sheetlengthwise of the strips being cut during'intermissions. to the cuttingoperations toprovide as a re;

. I geotace sult of a succession of the cuts. a complete cutand therebya cut scalloped strip.

' 3. The method of cutting metal sheets into scalloped strips,comprising dividing by intermittently shearing said sheet for a part ofits length along a zig-zag line, and feeding saidsheet'lengthwise of thestrips being cut during intermissions to the cutting operations toprovide as a result of a succession 3 bf the cuts a complete cutand,thereby, acut scalloped strip, and limiting the d1splacement of saidstrip by the cutting dies to an amount, less than will cause distortion..4. The method of cutting metal sheets i into scalloped strips,comprising dividing by intermittently shearing said sheet for a part ofits length along a plurality of zig-zag lines bya succession ofsimultaneous cuts,

,Fand feeding said sheet lengthwise of the strips being cut duringinter-missions to the cutting operations to provide as aresult of asuccession of the cuts aplurality of complete cuts and thereby aplurality of cut scalloped strips.

- 5. The inetho intogscalloped .strips,compris1ng dividing by d e fcutting metal sheets 'rogressfiely and intermittently shearingsiifdsheet for a part of its length along a "plurality of zig-zag lines by asuccession of s multaneous cuts,) and feeding said sheet 'lengthwise ofthe stripsbeingcut during intermissions to the c tting operations toprovide as 'a result 0 a succession of the cuts plurality of cutscalloped st'rips.

a plurality of complete cuts andthereby a scalloped strips, comprisingdividing by. in.

termittently shearing saidsheet for a part of its length along aplurality of longitudinally extended zig-zag lines, foi; a succession ofsimultaneous cuts, and feeding said sheet during intermissions to g thecutting operations toprovide as a result of a succession of thecuts aplurality of complete cuts and thereby a plurality of cut scallopedstrips,

said sheet being fed lengthwise. o

7 The method of cla m 1, further'charac terized that each of thesuccessive cuts is longer t an the feed, so that the cuts overlap toform continuous cuts.

8. The method of claim 1', further characterized in that each ofthesuccessive cuts islonger than the feed and the cuts are made ofvarying depths to form partial cuts at one end which are completed bythe overlappmg of the next successive cuts.

" 9. A mahine for cutting a-metal sheet into scalloped stripsextending-longitudinally of the, sheet, comprising opposed' shearing cutone sideof one scallop, and arranged to d es having cutting edgesadapted each to simultaneously cut the reversed sides of'the v scallopsof one lateral series, and alternatelyacting stamp ng and feeding means,the latter adapted for feeding the sheet endwise after each cuttingstroke.

10. A cutter for dividing metal sheets,

comprising a reciprocating 'zig-Zag cutter adapted to make a pluralityof cuts part way of the length of a sheet, and means for intermit-tently feeding said sheet leugthwiseto said cutter, whereby toprovide as a result of a succession of said cuts a plurality of completecuts and thereby a cut scalloped strip, said cutter comprising partsadapted to cross progressively lengthwise thereof and to therebyprogressively cut;

115A cutter for dividing metal sheets, comprising a reciprocatingzig-zag cutter adapted to make a cut part way of the lengthof asheet,and means for intermittently feeding said sheetlengthwise to saidcutter, whereby to pnovide' as a result of a succession of said cuts acomplete cut and thereby a cut scalloped strip, said cutter comprising apair of cutting edges having an inclined relation to each other, wherebysaid edges cross progressively lengthwise thereof and have a progressiveshearing action.

12. A cutter for dividing metal sheets, comprising a reciprocating zg-zag cutter adapted to make a out part way of the length of a sheet,and means for intermittently feeding said sheet lengthwise to saidcutter,

whereby to provide as a result of-a succession of said cuts a completecut and thereby a cut scalloped strip, said cutter comprising a pair ofcutting edges having an inclined re-1 lation to each other, whereby saidedges cross progressively lengthwise thereof and have a progressiveshearing action, saidinclination. of said cutting edge being slight sothatthe metal will not be set or strained when carried beyond themeeting .points of the edges in the act of cutting. V

13. A cutter for dividing metal sheets, comprising a plurality ofreciprocating zigzag cutters ada ted to make simultaneous cuts part way0 the length of a sheet, and.v means for intermittently feeding saidsheet lengthwise to said cutters, whereby to provide as a result of asuccession of said cuts a plurality of complete cuts, and thereby aplurality of cut scalloped strips, said outters comprising a pair ofcuttingdies and a reciprocating plunger carrying one of .said pairofdies. Y i

14. A cutter for dividing metal sheets,

comprising a plurality of reciprocating zigzag cutters adapted. to makesimultaneous cuts part way of the length of a-sheet, and means forintermittently-feeding saidsheet lengthwise to -said cutters,whereby toprowide as a result of a succession ofsaid cuts a plurality ofcompletecuts, and thereby a plurality of cat. scalloped strips, saidcutwhereby .said edges cross progressively lengthwise thereof and have aprogressive shearing action.

15. A cutter for dividing met-alsheets, comprising a reciprocatingzig-zag cutter adapted to make a out part wayof the length ofa sheet,and means for intermittently'feeding' said sheet lengthwise to saidcutter,

whereby to provide as a result ofa succession of said cuts a completecutand thereby a cut scalloped strip, said cutter comprisingv inclinedcutting edges adapted to cross progressively lengthwise thereof and tothereby progressively shear the sheet, and means for limiting thereciprocating movement of said cutting parts to an extent that whenmoved together a shearing cut less than the complete length'ofthecutters is made.

1 16. A cutter for dividing metal sheets, comprising a plurality ofreciprocating zigzag cutters adapted to make simultaneous cuts part wayof'the length of av sheet, and

means for intermittently feeding said sheet lengthwise to said cutters,whereby to provide as a'result 'of a succession of said cuts,

a plurality of complete cuts, and thereby a plurality of cut scallopedstrips, said cutters comprising a pair-of-cuttingdies and a're Iciprocating plunger carrying one of said pair of dies, the edges of saidpair of dies having an inclined relation one to another, whereby saidedges cross progressively lengthwise thereof and have a progressiveshearing action, and means for limiting. the reciprocating movement ofsaid plunger to an extent that when the cutters are moved together a outless thanthe complete length of shearing the cutters 1s made.

17. A. machine according to claim 9, fur-- ther characterized in thatthe'shearing dies have cutting edges long r than the feed.

strokes. 18. A machine according to claim 9, further characterized inthat the shearing edges of'-the dies are relatively inclined to cut,

progressively from end-to end.

19. Av machine according to claim 9, fur-v ther characterized in thatthe'shearing edges of the dies are relatively inclined to outprogressively from end to 'end and to cut only partly through at theadvancing ends, the

stroke.

my name.

Inwi tness whereof, I ha ve hereunto signed o'r'ro s. Barns,

out being completed at the next succeeding 12c

